Final answer:
The effective interest rate of this loan is 10%.
Step-by-step explanation:
The effective interest rate of this loan can be calculated by dividing the interest expense by the net loan amount. The net loan amount is the loan amount minus the compensating balance. In this case, the loan amount is $500,000 and the compensating balance is 20% of the loan amount, which is $100,000. Therefore, the net loan amount is $500,000 - $100,000 = $400,000.
The interest expense is calculated by multiplying the loan amount by the interest rate. In this case, the interest rate is 8%, so the interest expense is $500,000 * 8% = $40,000.
Now, we can calculate the effective interest rate by dividing the interest expense by the net loan amount: $40,000 / $400,000 = 0.1, or 10%.
Therefore, the effective interest rate of this loan is 10% (option B).